[gnome-flashback] system-indicators: add SiIndicator

[Alberts Muktupāvels <muktupavels src gnome org>]

commit a49ffbad972da94826871a183676722f09a17c71
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Dec 22 18:31:22 2019 +0200

    system-indicators: add SiIndicator

 system-indicators/Makefile.am    |   2 +
 system-indicators/si-indicator.c | 327 +++++++++++++++++++++++++++++++++++++++
 system-indicators/si-indicator.h |  45 ++++++
 3 files changed, 374 insertions(+)
---
diff --git a/system-indicators/Makefile.am b/system-indicators/Makefile.am
index 6a51676..6e4f599 100644
--- a/system-indicators/Makefile.am
+++ b/system-indicators/Makefile.am
@@ -20,6 +20,8 @@ system_indicators_la_CFLAGS = \
 system_indicators_la_SOURCES = \
        si-applet.c \
        si-applet.h \
+       si-indicator.c \
+       si-indicator.h \
        si-menu-bar.c \
        si-menu-bar.h \
        si-module.c \
diff --git a/system-indicators/si-indicator.c b/system-indicators/si-indicator.c
new file mode 100644
index 0000000..f5b1319
--- /dev/null
+++ b/system-indicators/si-indicator.c
@@ -0,0 +1,327 @@
+/*
+ * Copyright (C) 2019 Alberts Muktupāvels
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+#include "si-indicator.h"
+
+#include <libgnome-panel/gp-image-menu-item.h>
+#include <libgnome-panel/gp-utils.h>
+
+typedef struct
+{
+  GpApplet  *applet;
+
+  GtkWidget *menu_item;
+
+  GtkWidget *image;
+
+  char      *filename;
+} SiIndicatorPrivate;
+
+enum
+{
+  PROP_0,
+
+  PROP_APPLET,
+
+  LAST_PROP
+};
+
+static GParamSpec *indicator_properties[LAST_PROP] = { NULL };
+
+G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (SiIndicator, si_indicator, G_TYPE_OBJECT)
+
+static cairo_surface_t *
+surface_from_pixbuf (GdkPixbuf *pixbuf,
+                     int        scale)
+{
+  int width;
+  int height;
+  cairo_surface_t *surface;
+  cairo_t *cr;
+
+  width = gdk_pixbuf_get_width (pixbuf);
+  height = gdk_pixbuf_get_height (pixbuf);
+
+  surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
+  cr = cairo_create (surface);
+
+  gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
+  cairo_paint (cr);
+
+  cairo_destroy (cr);
+
+  cairo_surface_set_device_scale (surface, scale, scale);
+
+  return surface;
+}
+
+static void
+update_icon (SiIndicator *self)
+{
+  SiIndicatorPrivate *priv;
+  guint icon_size;
+
+  priv = si_indicator_get_instance_private (self);
+  icon_size = gp_applet_get_panel_icon_size (priv->applet);
+
+  if (priv->filename != NULL)
+    {
+      int scale;
+      GError *error;
+      GdkPixbuf *pixbuf;
+      cairo_surface_t *surface;
+
+      scale = gtk_widget_get_scale_factor (priv->image);
+      icon_size *= scale;
+
+      error = NULL;
+      pixbuf = gdk_pixbuf_new_from_file_at_size (priv->filename,
+                                                 icon_size,
+                                                 icon_size,
+                                                 &error);
+
+      if (error != NULL)
+        {
+          g_warning ("%s", error->message);
+          g_error_free (error);
+
+          si_indicator_set_icon_name (self, "image-missing");
+
+          return;
+        }
+
+      surface = surface_from_pixbuf (pixbuf, scale);
+      g_object_unref (pixbuf);
+
+      gtk_image_set_from_surface (GTK_IMAGE (priv->image), surface);
+      cairo_surface_destroy (surface);
+    }
+  else
+    {
+      gtk_image_set_pixel_size (GTK_IMAGE (priv->image), icon_size);
+    }
+}
+
+static void
+panel_icon_size_cb (GpApplet    *applet,
+                    GParamSpec  *pspec,
+                    SiIndicator *self)
+{
+  update_icon (self);
+}
+
+static void
+scale_factor_cb (GtkImage    *image,
+                 GParamSpec  *pspec,
+                 SiIndicator *self)
+{
+  update_icon (self);
+}
+
+static void
+si_indicator_constructed (GObject *object)
+{
+  SiIndicator *self;
+  SiIndicatorPrivate *priv;
+
+  self = SI_INDICATOR (object);
+  priv = si_indicator_get_instance_private (self);
+
+  G_OBJECT_CLASS (si_indicator_parent_class)->constructed (object);
+
+  g_signal_connect_object (priv->applet,
+                           "notify::panel-icon-size",
+                           G_CALLBACK (panel_icon_size_cb),
+                           self,
+                           0);
+}
+
+static void
+si_indicator_dispose (GObject *object)
+{
+  SiIndicator *self;
+  SiIndicatorPrivate *priv;
+
+  self = SI_INDICATOR (object);
+  priv = si_indicator_get_instance_private (self);
+
+  g_clear_pointer (&priv->menu_item, gtk_widget_destroy);
+
+  G_OBJECT_CLASS (si_indicator_parent_class)->dispose (object);
+}
+
+static void
+si_indicator_finalize (GObject *object)
+{
+  SiIndicator *self;
+  SiIndicatorPrivate *priv;
+
+  self = SI_INDICATOR (object);
+  priv = si_indicator_get_instance_private (self);
+
+  g_clear_pointer (&priv->filename, g_free);
+
+  G_OBJECT_CLASS (si_indicator_parent_class)->finalize (object);
+}
+
+static void
+si_indicator_set_property (GObject      *object,
+                           guint         property_id,
+                           const GValue *value,
+                           GParamSpec   *pspec)
+{
+  SiIndicator *self;
+  SiIndicatorPrivate *priv;
+
+  self = SI_INDICATOR (object);
+  priv = si_indicator_get_instance_private (self);
+
+  switch (property_id)
+    {
+      case PROP_APPLET:
+        g_assert (priv->applet == NULL);
+        priv->applet = g_value_get_object (value);
+        break;
+
+      default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+        break;
+    }
+}
+
+static void
+install_properties (GObjectClass *object_class)
+{
+  indicator_properties[PROP_APPLET] =
+    g_param_spec_object ("applet",
+                         "applet",
+                         "applet",
+                         GP_TYPE_APPLET,
+                         G_PARAM_CONSTRUCT_ONLY |
+                         G_PARAM_WRITABLE |
+                         G_PARAM_STATIC_STRINGS);
+
+  g_object_class_install_properties (object_class, LAST_PROP,
+                                     indicator_properties);
+}
+
+static void
+si_indicator_class_init (SiIndicatorClass *self_class)
+{
+  GObjectClass *object_class;
+
+  object_class = G_OBJECT_CLASS (self_class);
+
+  object_class->constructed = si_indicator_constructed;
+  object_class->dispose = si_indicator_dispose;
+  object_class->finalize = si_indicator_finalize;
+  object_class->set_property = si_indicator_set_property;
+
+  install_properties (object_class);
+}
+
+static void
+si_indicator_init (SiIndicator *self)
+{
+  SiIndicatorPrivate *priv;
+
+  priv = si_indicator_get_instance_private (self);
+
+  priv->menu_item = gp_image_menu_item_new ();
+  g_object_ref_sink (priv->menu_item);
+
+  priv->image = gtk_image_new ();
+  gp_image_menu_item_set_image (GP_IMAGE_MENU_ITEM (priv->menu_item),
+                                priv->image);
+
+  g_signal_connect (priv->image,
+                    "notify::scale-factor",
+                    G_CALLBACK (scale_factor_cb),
+                    self);
+
+  gp_add_text_color_class (priv->image);
+}
+
+GpApplet *
+si_indicator_get_applet (SiIndicator *self)
+{
+  SiIndicatorPrivate *priv;
+
+  priv = si_indicator_get_instance_private (self);
+
+  return priv->applet;
+}
+
+GtkWidget *
+si_indicator_get_menu_item (SiIndicator *self)
+{
+  SiIndicatorPrivate *priv;
+
+  priv = si_indicator_get_instance_private (self);
+
+  return priv->menu_item;
+}
+
+void
+si_indicator_set_icon_name (SiIndicator *self,
+                            const char  *icon_name)
+{
+  SiIndicatorPrivate *priv;
+
+  priv = si_indicator_get_instance_private (self);
+
+  g_clear_pointer (&priv->filename, g_free);
+  gtk_image_clear (GTK_IMAGE (priv->image));
+
+  if (icon_name == NULL)
+    {
+      gtk_widget_hide (priv->image);
+      return;
+    }
+
+  gtk_image_set_from_icon_name (GTK_IMAGE (priv->image),
+                                icon_name,
+                                GTK_ICON_SIZE_MENU);
+
+  update_icon (self);
+
+  gtk_widget_show (priv->image);
+}
+
+void
+si_indicator_set_icon_filename (SiIndicator *self,
+                                const char  *filename)
+{
+  SiIndicatorPrivate *priv;
+
+  priv = si_indicator_get_instance_private (self);
+
+  g_clear_pointer (&priv->filename, g_free);
+  gtk_image_clear (GTK_IMAGE (priv->image));
+
+  if (filename == NULL)
+    {
+      gtk_widget_hide (priv->image);
+      return;
+    }
+
+  priv->filename = g_strdup (filename);
+  update_icon (self);
+
+  gtk_widget_show (priv->image);
+}
diff --git a/system-indicators/si-indicator.h b/system-indicators/si-indicator.h
new file mode 100644
index 0000000..3c6de04
--- /dev/null
+++ b/system-indicators/si-indicator.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2019 Alberts Muktupāvels
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SI_INDICATOR_H
+#define SI_INDICATOR_H
+
+#include <libgnome-panel/gp-applet.h>
+
+G_BEGIN_DECLS
+
+#define SI_TYPE_INDICATOR (si_indicator_get_type ())
+G_DECLARE_DERIVABLE_TYPE (SiIndicator, si_indicator, SI, INDICATOR, GObject)
+
+struct _SiIndicatorClass
+{
+  GObjectClass parent_class;
+};
+
+GpApplet  *si_indicator_get_applet        (SiIndicator *self);
+
+GtkWidget *si_indicator_get_menu_item     (SiIndicator *self);
+
+void       si_indicator_set_icon_name     (SiIndicator *self,
+                                           const char  *icon_name);
+
+void       si_indicator_set_icon_filename (SiIndicator *self,
+                                           const char  *filename);
+
+G_END_DECLS
+
+#endif